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Schedule II (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 3,392 $ 6,783 $ 10,443
Additions Charged to Expenses 1,368 1,402 3,531
Net Deductions (Recoveries) (2,463) (4,793) (7,191)
Balance at End of Year 2,297 3,392 6,783
Valuation allowance for deferred tax assets      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 5,714 5,741 5,773
Additions Charged to Expenses 0 0 0
Net Deductions (Recoveries) (9) (27) (32)
Balance at End of Year $ 5,705 $ 5,714 $ 5,741